Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in OC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 9.2M | $996.8M | -1.5% | 11.438% | 0.02% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 5.5M | $596.1M | — | 6.840% | 0.03% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 3.6M | $391.5M | — | 4.493% | 0.01% |
| 4 | STATE STREET CORP | 3.1M | $334.0M | -0.4% | 3.805% | 0.01% |
| 5 | DIMENSIONAL FUND ADVISORS LP | 2.8M | $299.2M | +7.3% | 3.433% | 0.06% |
| 6 | AQR CAPITAL MANAGEMENT LLC | 2.5M | $271.4M | +77.3% | 3.154% | 0.12% |
| 7 | UBS ASSET MANAGEMENT AMERICAS INC | 2.2M | $240.2M | +72.8% | 2.756% | 0.05% |
| 8 | FIRST TRUST ADVISORS LP | 2.2M | $235.8M | +22.7% | 2.706% | 0.17% |
| 9 | DAVIS SELECTED ADVISERS | 2.1M | $227.4M | +2.7% | 2.609% | 1.04% |
| 10 | AMERICAN CENTURY COMPANIES INC | 2.0M | $221.0M | +549.5% | 2.536% | 0.11% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 1.9M | $214.3M | +8.7% | 2.345% | 0.01% |
| 12 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.3M | $138.3M | -2.7% | 1.587% | 0.07% |
| 13 | Allspring Global Investments Holdings, LLC | 1.2M | $125.5M | +721.9% | 1.453% | 0.21% |
| 14 | NORDEA INVESTMENT MANAGEMENT AB | 1.1M | $118.1M | +228.3% | 1.399% | 0.11% |
| 15 | MILLENNIUM MANAGEMENT LLC | 1.0M | $109.3M | +68.1% | 1.255% | 0.07% |
| 16 | TWO SIGMA INVESTMENTS, LP | 973K | $105.2M | +13.9% | 1.208% | 0.09% |
| 17 | GENDELL JEFFREY L | 941K | $101.8M | +2.0% | 1.168% | 1.39% |
| 18 | HARRIS ASSOCIATES L P | 915K | $99.1M | +226.3% | 1.137% | 0.13% |
| 19 | MORGAN STANLEY | 826K | $89.4M | +12.5% | 1.026% | 0.01% |
| 20 | DEUTSCHE BANK AG\ | 764K | $82.6M | +4.5% | 0.948% | 0.03% |
| 21 | BANK OF AMERICA CORP /DE/ | 744K | $80.5M | -3.2% | 0.924% | 0.01% |
| 22 | GOLDMAN SACHS GROUP INC | 732K | $79.3M | +87.0% | 0.909% | 0.01% |
| 23 | NORTHERN TRUST CORP | 718K | $77.7M | +1.3% | 0.892% | 0.01% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 701K | $75.8M | +5.3% | 0.870% | 0.01% |
| 25 | VICTORY CAPITAL MANAGEMENT INC | 683K | $73.9M | -9.3% | 0.848% | 0.05% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in OC — a direct measure of their conviction.
Filings activity in OC during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 618 | 2.8% | 82.26% | 0.27 pp | $8.04B | 0.3% |
| Q4 2025 | 636 | 8.6% | 82.53% | 19.81 pp | $8.07B | 19% |
| Q3 2025 | 696 | +0.9% | 102.34% | +2.02 pp | $10.01B | +2.0% |
| Q2 2025 | 690 | 2.8% | 100.32% | +1.42 pp | $9.81B | +1.4% |
| Q1 2025 | 710 | 6.1% | 98.90% | 21.31 pp | $9.67B | 18% |
| Q4 2024 | 756 | +6.5% | 120.21% | 9.98 pp | $11.76B | 7.7% |
| Q3 2024 | 710 | +1.6% | 130.19% | 1.25 pp | $12.73B | 0.9% |
| Q2 2024 | 699 | — | 131.44% | — | $12.85B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying OC stock.
Based on Q1 2026 13F filings, institutional ownership of Owens Corning stands at 82.3%, held across 618 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OC, with approximately 9,210,864 shares worth $1.00B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of OC, including MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for OC is 45 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
108 institutions opened new positions in OC during Q1 2026, while 126 fully exited. 193 added to existing positions and 311 trimmed.
OC institutional ownership fell by 0.27 percentage points quarter-over-quarter, with a net change of -18 holders.
The top 10 institutions account for 47.4% of all reported 13F value in OC, and the top 25 account for 66.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Owens Corning (OC) Institutional Ownership